145 lines
3.6 KiB
Go
145 lines
3.6 KiB
Go
/*
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Copyright 2017 The Fission Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package publisher
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import (
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"bytes"
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"io/ioutil"
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"net/http"
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"strings"
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"time"
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"go.uber.org/zap"
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)
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type (
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// WebhookPublisher for a single URL. Satisfies the Publisher interface.
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WebhookPublisher struct {
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logger *zap.Logger
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requestChannel chan *publishRequest
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maxRetries int
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retryDelay time.Duration
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baseURL string
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}
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publishRequest struct {
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body string
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headers map[string]string
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target string
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retries int
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retryDelay time.Duration
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}
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)
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// MakeWebhookPublisher creates a WebhookPublisher object for the given baseURL
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func MakeWebhookPublisher(logger *zap.Logger, baseURL string) *WebhookPublisher {
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p := &WebhookPublisher{
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logger: logger.Named("webhook_publisher"),
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baseURL: baseURL,
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requestChannel: make(chan *publishRequest, 32), // buffered channel
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// TODO make this configurable
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maxRetries: 10,
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retryDelay: 500 * time.Millisecond,
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}
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go p.svc()
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return p
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}
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// Publish sends a request to the target with payload having given body and headers
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func (p *WebhookPublisher) Publish(body string, headers map[string]string, target string) {
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// serializing the request gives user a guarantee that the request is sent in sequence order
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p.requestChannel <- &publishRequest{
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body: body,
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headers: headers,
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target: target,
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retries: p.maxRetries,
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retryDelay: p.retryDelay,
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}
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}
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func (p *WebhookPublisher) svc() {
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for {
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r := <-p.requestChannel
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p.makeHTTPRequest(r)
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}
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}
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func (p *WebhookPublisher) makeHTTPRequest(r *publishRequest) {
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url := p.baseURL + "/" + strings.TrimPrefix(r.target, "/")
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msg := "making HTTP request"
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level := zap.ErrorLevel
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fields := []zap.Field{zap.String("url", url), zap.String("type", "publish_request")}
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// log once for this request
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defer func() {
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if ce := p.logger.Check(level, msg); ce != nil {
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ce.Write(fields...)
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}
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}()
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var buf bytes.Buffer
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buf.WriteString(r.body)
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// Create request
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req, err := http.NewRequest(http.MethodPost, url, &buf)
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if err != nil {
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fields = append(fields, zap.Error(err))
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return
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}
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for k, v := range r.headers {
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req.Header.Set(k, v)
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}
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// Make the request
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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fields = append(fields, zap.Error(err), zap.Any("request", r))
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} else {
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var body []byte
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body, err = ioutil.ReadAll(resp.Body)
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if err != nil {
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fields = append(fields, zap.Error(err), zap.Any("request", r))
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msg = "read response body error"
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} else {
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fields = append(fields, zap.Int("status_code", resp.StatusCode), zap.String("body", string(body)))
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if resp.StatusCode >= 200 && resp.StatusCode < 400 {
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level = zap.InfoLevel
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} else if resp.StatusCode >= 400 && resp.StatusCode < 500 {
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msg = "request returned bad request status code"
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level = zap.WarnLevel
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} else {
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msg = "request returned failure status code"
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}
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return
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}
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}
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// Schedule a retry, or give up if out of retries
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r.retries--
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if r.retries > 0 {
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r.retryDelay *= time.Duration(2)
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time.AfterFunc(r.retryDelay, func() {
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p.requestChannel <- r
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})
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} else {
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msg = "final retry failed, giving up"
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// Event dropped
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}
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}
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